Curtains(1983) [Brooke Parsons]: Shot in the chest, along with John Vernon, by Samantha Eggar; Linda and John then fall through the window. (Thanks to Dick Hertz and Eric)

Emmerdale Farm(2007; I don't know the exact date) [Rosemary King]: Burned to death (off-screen) in a house fire; we learn of her death when a police officer informs her stepchildren. Her ashes are later shipped back to England from America. (The IMDB lists Linda's last appearance on the show as being the Sept. 12, 2007 episode; I don't know how long afterwards the character's death was established.) (Thanks to Brian)